This is a weapon and so is capable of lethality and that is for all people within range. This includes the launcher. Don’t throw when there is wind, rain, or so on that can affect trajectory. If you screw up the throw people may be at risk and it may swing back and stab you. You make this at your own risk. This may be illegal in your area, so check. Don’t blame me.
Now that is out of the way, let’s get started!
By the way you can mix the steps up into what you want to do ( within reason ) this is just the order i did it in.